In Chinese zoos, they do things just a bit differently than here in the States. For example, the flow of foot traffic is typically reversed, in place of popcorn and hot dogs you may find more traditional Chinese fare such as fish balls or steamed buns - oh, and also you may notice some of their exhibits mounting the other exhibits and racing them around while roaring, frothing at the mouth and just generally scaring the holy **** out of everybody forever.
In this particular exhibit, an adult lion is trained to climb onto a waiting horse, which then jogs about the ring while the bravest, cruelest, or perhaps the most dangerously suicidal man in all of China provides incentive by cracking his whip at them. Yes, in Chinese zoos there is a man whose sole duty is to make sudden movements and loud noises in order to frighten and aggravate the Horse-mounted Lion Cavalry.